Towards new cesium containing manganese vanadates via a precursor method

• Published in: CrystEngComm Vol. 23; no. 39; pp. 6909 - 6914
• Main Authors: Zou, Yan-Min, Lan, Xiao-Yun, Ma, Wen, Jin, Jian-Ce, Sun, Hai-Yan, Li, Ji-Long, Feng, Mei-Ling, Huang, Xiao-Ying
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 11.10.2021
• Subjects: Aqueous solutions; Cesium; Cesium ions; Chains; Channels; Hydrothermal reactions; Manganese ions; Precursors; Vanadates; Water chemistry
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/D1CE00921D

Two new cesium containing manganese vanadates are synthesized by a facile method. The known compound K 2 Mn(VO 3 ) 4 (1), synthesized via a milder method than the previous hydrothermal reaction, was firstly used as a precursor to prepare two new manganese vanadates, namely CsMn(VO 3 ) 3 ·H 2 O (2) and Cs 4.34 Mn 1.83 (VO 3 ) 8 ·2.965H 2 O (3) in concentrated Cs + aqueous solutions at 80 °C. Compound 2 features a three-dimensional (3D) microporous framework constructed from serrated (VO 3 ) n chains interconnected by Mn 2+ ions. The Cs + ions and the lattice water molecules are located in the channels of the structure along the a -axis. In compound 3, the sinusoidal (VO 3 ) n chains are linked by Mn 2+ ions into V–O–Mn double chains, which are further weaved by {Mn 4 O 8 } units to form a 3D microporous network with channels occupied by disordered Cs + ions. Compounds 2 and 3 are the first Cs–Mn–V–O examples with a 3D microporous framework. Thermal stabilities of compounds 2 and 3 were investigated by thermogravimetric (TG) analysis. This work provides an effective synthetic method for preparing alkali-metal containing heterometallic vanadates with new composition and structures.